[Source] tracking down the elusive Xj3D Extrusion node for debugging

[Justin Couch]

All geometry is calculated down at the node implementation level, and then
derived for the individual renderers.

org.web3d.vrml.renderer.common.nodes.geometry2d.BaseExtrusionNode
org.web3d.vrml.renderer.ogl.nodes.geometry2d.OGLExtrusion

-- 
Justin